Preheater-plate.



Tooll wh mt H 1 1 Be it known. that II, A ur est. a tizen f he Un ted; ta e d 35i? dent of Elkins Park, Pennsylvania, haveiiia en ed a er ain ew and usef Br heaterr. Plate, of which the following is. a speciiica: iQ l- I 'llhe, purpose. of: my invention st prov a s e id Wit preheating irxpassag'es revers'ely directed in straight lines and in Which the air comes in contact with theouiter side wall of the plate at. every turn. .1

A further purpose of. my invention is to introduce the air at one edge of the plate, to pre-heat it and to deliverit at. the opposite edge of the plate in a diagonal direction:

A further purpose of my invention is to vary the width of pre-heating passages from one side of plate to the other so that the air shall have additional space in approximate proportion to the increased volume as its temperature increases.

Further purposes will appear from the specification and the claims appended thereto.

I have preferred to illustrate my invention by forms thereof which are known to be practical, effective and inexpensive and which at the same time well illustrate the principles of my invention.

Figure 1 is a top plan view of a plate embodying one form of my invention.

Fig. 2 is a side elevation part1; broken of the structure shown in Fig. 1.

Fig. 3 is a side elevation of another form of my invention. r V

The top plate 5, in both of the forms illustrated, is provided with an inlet opening 6 located close to the edge of the plate and shown as controlled by av controller 7 described and claimed by me in another application,'co-pending herewith. The controller is here shown as pivoted. The controller is effective as a cam closure for the opening 6, in that the outer wall of the opening 8 is eccentrically formed to gradually close the opening 6 with counter-clockwise movement. The controller carries indicator 9, and moves within raised guard walls 10, which are interrupted at 11 to allow air passage, free from possible accidental closure by utensils placed upon the lid.

I prefer to make the bottom structure separable from the top plate 5 and show it in teeeee ee nere F' zseomp ising a ottom all pwxim tely paral el to. the e pla e and; connecting ewith. by. outer approx ma e y ylin ica sid wan 1:3. and par i i n walls 4:. so. a tep' ovicle passages. eg nning at the op ni gand. ischarging. priest m ly diagon ily through. a numb r of holes. 21 Pl ce a ou s it ble part. ftlre t n.

in ers ee. I .1

- I have sh ar-n. he; two parts of thetplate. asre ain d suitab e means. uch as. stove bolts 22. For the purpose of} relieving. he. retaining 22: rom ide stra n, I have supported the wall 13 laterally, preferably placing it 1 within a correspondingly wshapedi ring 23.

I have shown the Wall 18 as shortened to give room for any usual form of litter recess 24.

Since the volume of the air increases with the increase of temperature, and in order to provide cross sectional area for the passages approximately proportionate thereto, I have spaced the partition walls 1 1 to 20 by increasing intervals, intended to correspond to the increase of volume with the normal condition of the fire when the plate is used. Obviously, this will vary somewhat with the position which the plate is intended a to occupy. Ordinarily the plate will be located close to'the smoke flue and at a dis tance from the fire box.

In the form shown in Fig. 3 I have proportioned the cross sectional areas of the successive passages in a different way, by sloping the bottom plate 12 away from the top plate from the inlet to the discharge sides, thus giving additional cross sectional area as the discharge opening is approached. Obviously, either or both of these methods of proportioning the cross section can be used at will and the change of section can be reg ular or irregular, as conditions otuse or convenience may dictate.

The diagonal direction of discharge of pro-heated air is desirable for some purposes, as it gives a distribution of the air which proves particularly effective when this lid is placed near to the fire box. The effect is improved by locating the openings about the raeeea Dee 1.15 w th; .appttcationifilellllqbrta y 16.1 12. se iaia. 653 ,9318; a

the passagesisfexposed to the heat of'the interior of the stove through the bottom wall at all times and that. it is additionally exosedffto' j thisv outside wall heating effect throughout one entire side of the passage at tion,; and; throughout the outside wall at the point" of discharge, giving highly advantageous outside Wall heatin'g effect- 1 In the form shown in Fig. 3 the heat from,

' the bottom'wall is "relatively increased in the passages nearest to the inlet by the relative shallowness of-thesepass'ages.

It will be evident that in the form shown inFi'g. 3, the conoidal form of the wall 25 greatly reduces-the disparity in heightsbetwe'en the walls at26 and at 27 and that this bjeveling maybe-as-great in height at any point and extend as far cir cumferentially, as-"may be desired to facili- 7 if tate the placing of'the plate by the'taper thus provideds' l Having thus described my invention, What I claim asnew and desire to secure by Letters Patent is:

1. In a stove lid, a top plate provided with an inlet opening, a' bottom plateat an angle to said top plate, parallel partitions forming air passages therebetween and an outer side stantially parallel partitions forming air passages between the plates of different cross section, growing larger asthe outlet is approached and an outer wallof generally cylindrical shape apertured to provide outlet in proximity to "the pointof greatest spacing between the top and-bottom plates.

- SAMUEL H. TACY.

- Witnesses:

HELEN I. KAUFFMAN,

- WM. STEELL JAoKsoN.

qopieaot this patentzmay be obtainedfor five cents each, by addressing the Commissioner of Patents, a v Washington, D. 0." 

